The table shows the number of hours, a teacher invests on his daily activities. What is the ratio between sum of time invested by the teacher on 'teaching and reading' & 'sleep and play'?

7 : 4 

Time invested on 'teaching and reading'  :   Time invested on 'sleep and play'

                   ( 8 + 6 )                            :             ( 7 + 1 )

                        14                                :                  8

                        7                                  :                  4